Two I've read recently that I liked a lot are The Widow of the South by Robert Hicks, and Seen the Glory by John Hough Jr. The first got me really interested in Franklin, which I didn't know much about before I read it, and the second is a great account of Gettysburg--I couldn't stand at the Copse of Trees and think of it the same way again (if you read the book, you'll know why).